(n.) A trembling; a shivering or shaking; an involuntary quivering\ or vibratory motion; as, the tremor of a person who is weak, infirm, or old.

Bebung aphonia artificial voice bang bob bobble boot bounce broken speech broken tones broken voice bump charge childish treble choked voice cracked voice croak crow didder disquiet disquietude dither dithers dysarthria dyslalia dyslogia dysphasia dysphonia dysphrasia falsetto falter fidgetiness fidgets flush flutter grimace harshness hawking voice heaving hiss hoarseness idioglossia idiolalia impairment of speech inquietude jar jerk jig jigget jiggle jog joggle jollies jolt jostle kick lift lisp lisping loss of voice muzzy speech nasal tone nasalization palpitation panting pitapat pitter-patter quake quaker quaking quaver quavering quiver quivering restlessness rictus rush rush of emotion sensation shake shakes shaking shiver shivers shock shudder sibilation speech defect speech impediment surge of emotion temblor thrill throb throbbing tic tingle tingling titillation tremble trembling tremolando tremolant tremolo tremor of excitement trepidation trepidity trill trillet trilleto trillo twang twitch twitter unrest vibrate vibrato wobble